Dental x-ray-film package



May 5, i925.

M. B. HODGSON DENTAL X RAY FILM PACKAGE Filed July 14, 1920 2 Shee'ts-Sheet l INVENTOR 4jlfillmilfo son,

A'RNEYS.

WITNESSES:

FIELFIQJZ- May 5, l925. I 1,536,34

M. B. HODGSON" DENTAL X RAY FILM PACKAGE Filed July 14, 1920 2 Srueelzs-Shee't.v 2

INVENTOR ATTORNEYS.

Patented. May 5.1925. A U if l'zlE MILLABD'B. `HODGSON, 0F ROCHESTER, NEW' YORK, ASSIGNOR TO EAASTMAN KODAK y COMPANY, OF ROCHESTER, NEW' YORK, A CORPORATION OF NEW YORK.. I

DENTAL x-nAY-FILM PACKAGE.

Application led'July 14, 1920. Serial No. 396,188.

Monroe and State` of New York, have in- Vvented certain new and useful Improvements in Dental X-Ray-Film Packages, of

` which the following-is a full, clear, and exact specification.

My invention relates to dental X-ray film packages designed for individual exposures, each lpackage being light tight and sold as an article of manufacture ready for use, and remaining unopened until the sensitized film is to be developed after exposure to. X-rays. It is desirable that such a package be at all times easily opened, that it permit of ready manipulation in the darkroom, that it shall be comfortable to the patient, that it be compact, thin and flat; as well asfeasy and cheap to manufacture; that it shall not be injuriously affected by water under normal operating conditions, and that the injurious effects of secondary rays be avoided.

It isv further desirable in such a package that while the package be suiiiciently ilexible to be curved or bent by slight pressure when necessary to fit the shape of the part of the oral cavity to be radiographed, that it shall not retain this distortion, but will when pressure is released regain its normal flat condition. It is customary for the patient to hold the package in position. lf the wrappings of the package are of such permeable material that they tend to hold any shape into which they are pressed, and to overcome the natural resilience of the sensitized ilm, the package may be given a permanent distortion; and if the patient at first presses the package into the wrong position and shape, and thereafter presses it into a different shape,it may become badly distorted, whereas if the natural resilience of the ihn is stronger than the tendency of the wrapping to assume a set position, the package will always tend to flatten out and an incorrect curvature will not remain. Moreover the used packages are more easily piled in the receptacle provided for them.

The objects of my invention are to furnish a package that will meet the above requirements and others that will appear hereinafter. I have discovered that a package that is thin, convenient, easy to manufacture, and not uncomfortable to the patient invention.

may be madeby enclosing the film with suitable. protective paper between two lat protective sheets which are caused to adhere at their edges by a waterproof, slow-drying, flexible adhesive. Such a package is easy .to open since the covers can be readily stripped apart. Moreoverif the salt of a heavy metal is incorporated with the adhesive the injurious effects of secondary radiation are overcome while the package is-not made so permeable that it willretain any shape into which it may'be bent, as tends *tobe the case when metal foil is used. By making one protective sheet of waterproof material and attaching the film toit by waterproof adhesive, this sheet can be used as a means for manipulating the film in the photographic baths.

elsv

Reference will now be made to the accom- Y certain wrappings torn away in part;

1g. 4 is a section of one end of the package shown in Fig. 3;

Figs. l5, 6, and 7 are fragmentary sections of other forms of packages embodying my Fig. 8 shows two of the rotective sheets as used in one form of pac age; i

' Figs. 9, 10 and 11', are sections of. other forms of packages embody-ing my invention. The package includes primarily a" sensi' tized sheet 1, a protective sheet 2, and a' cover sheet `3. `The sensitized |-sheet is of any usual or preferred form, such as a pyroxylin' support coated with a photographic emulsion. The protective sheet2 is preferably of black paper, but may be of any other material which is impervious to ordinary light rays but pervious to X-rays. It may be waterproofed in'any usual manner. The cover sheet 3 is pref' erably of textile material and is coated with an adhesive 4 which is relatively waterproof, slow-dryingl and pliable and which is adherent at ordinary temperatures. Such adhesives are well known, being of the type. used in surgical, adhesive tape. Typical adhesives comprise rubber and coal tar pitch with any suitable softener suchas benzol, gasoline or chloroform. Sheets: 2

loo

y and 3 aref of larger dimensions than .sheet 1.' A rotective sheet 5 of black ,paper or `eqiiiva ent material ofv the same" size and4 shapeV as the sensitized sheet 1, is placed between the film 1 and thesheet 3.' In manufacture, sheet 2 is laid upon a flat support, and the-film 1 laid thereon, leaving `a maryborder of uniform-width -of the sheet 2 vextending completely around it. The sheet 5 is then placedion the film 1, and in regis-* try therewith. Coverxsheet' 3,"which is of y If found necessary' or desirable be applied to insure-a tight joint.

the same size .and shape as sheet 2,is .then

positioned in registry therewith, and; ressure applied around the 'ed-ge .thereo the vfinger nailgor any lsuitab e tool or die,

pressing the border or margin of sheet 3 adhere, andthe twoshe'ets applied as' 'a -unit to the Vsheets 1 and`2 lying on rthesuvpport. heat mayv If desired the slieets'2 and '3 may have' registering extensions lor tabs v6 and 7 -atone end, which are preferably uncoated on -their facing surfaces. "In opening the packages these are grasped by the/user or by suitableclasps' of a film manipulating ap. params, and the parts readily separated.-

Since the adhesive is of a 'slow-drying, per- .v manently sticky type,"the parts can be separatked much more readily vthan if a i 35 harding -g'lue were used. This advantage exists even if the-tabs are not used,.in which the y which may7 be of service in case' the user starts the separation with a finger nail orknife at one corner and strips the 'sheets apart.. This structure showing 40 the 'extension and 4.

If the sheet' 3f is not Vcompletely opaque, rotectingsheet lying between it 'and the film may be ,made larger .than the lm but smaller than sheet' 3 so that its edge or` .tabs appears in Figs. 3

Iwill be bentI over the edge'of the film suiciently-to form a light seal. T his is shown 'in' Fig. 5, where the protective sheet is designated 5f the other elements being the same as in Fig- 2.

If desired the adhesive may be applied to the margins onl of sheet 3, as shown at 4f in Figs. 'and g, the other elements being as in Fig. 2. In Fig. 6, there' is alsoindicated at 8,.a cord imbedded inthe adhesive starting the These forms with opening of the package.

- the adhesive at the border only are in effect equivalents ofthe form .first described since the sheet 5 covers theinner surface of sheet 3' except for the border andthe two sheets together constitute acover sheet' having an adhesive at the border only. i

In Figures 8 'and 9,-is' shown a forniof` my invention in which the film adheres to -this art, double coated `on. In this case there [weight and density, ing no important commercial or manufacof being supported 'thereby durin graphic manipulations. In this support 10 carries a photographic emulsion 11,"and on one side thereof'is a rotective 'sheet 12, andfon the other side afs eet 13 `of material not injured by 'water,' such as a linen fabric or waterproofedI paper, and

coated 'at -14 with a 'slow-drying, adhesive' compositiom ofthe type already describedf The protectivesheets have extensions or tabs 16' and. 17byz1which 'they 'may be stripped' apart. Between the `film 10 and sheet -13 `isa protectivesheetA 15 having a central aperture 18, permitting the adhesive I4 to" come into contact with the back of the lm.- This the film will pin, 'or clasp during the photographic operations. It 'will e more convenient to 'cept that the sheet 2 has adhesive at certain places thereon as indicated at 40. The emulsionl side of the ilm faces' the protective sheet 5. The sheet'2 is waterproofed to permit of its use in the baths.

In Fi r`es 9 and 11, the emulsion surface of the is indicated, as in those forms it must face away from the adhesive contacting films butin the other forms it is immaterial an' is not indicated. As is common in ilm may be used.

. If desired both protective sheets may carry adhesive as indicated in Fig. 10, where the sheets 23, 23, have adhesive 24, 24 therewill be provided two inner rotective sheets 25, 25 and if desired two same packet.l

I propose, moreover, to incorporate in the adhesive compound the salts of a hea metal, in a' very finely divided condition.

Lead carbonate and lead oxide have been found satisfactory, having high atomic being cheap and involvturing disadvantages'. I contem late the use of any salt having high atomic weight such for in stanceas mercury` and density, oxide, 4 bismuth oxide, barium sulphate `and It is to be understood bismuth sulphate, calcium tungstate.

exemplary. Commercial, practical'and manufacturing reasons would affect the choice of the particular salt used. lThe purpose ofthe package may beopened` and I be carried-.by the cover sheet A 4which may be` supportedby any Asuitable y handle than the film alone which is smaller v and without such a handle.

s 21, 21 may be contained in the that the abovev list lis by Vno means exhaustive but is merely salt is to avoid the effects of secondary radiation by absorption of the rays passing through the film. The salt may be present in the composition in suspension or in solution.

It is obvious that in the form shown in F1 10 the salts would be included in the adesive on one side of the package only.

From the description of the various embodiments of m invention it is obvious that I have invente a package that lends itself readily to manufacture by hand or by suitable automatic machinery, Which can be readily opened and manipulated for hand development or in a suitably constructed machine, provided with means for clasping and operating the tabs. The resilience of the film will tend to maintain the package fiat while yielding under pressure, and the wrapping material being flexible, inelastic and inextcnsible will assume the shape determined by the film. The nature of the adhesive renders the package at all times easy to strip open. It does not become hard and brittle, which defects would make the package inflexible and liable to open at the joints when bent. The presence of the lead salts avoids the affects of secondary radiation Without increasing the thickness of the paolo.

age nor introducing the difficulties of manufacture and lack of inelasticity occasioned by the/use of metal foil.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

l. In a dental X-ray package, a sheet of sensitized material, a flexible protective sheet of larger dimensions than said sensitized sheet upon one side thereof, a flexible cover sheet of material on the opposite side of the sensitized sheet and having at its margins a coating of adhesive material and also of larger dimensions than said sensitized sheet, the margins of said protective and cover sheets extending beyond the edges of the sensitized sheet and there joined by such adhesive continuously around and outside of the entire periphery of the sensitized sheet and constituting the only means for holding the package Vclosed and light tight.

2. In a dental X-ray package, a sheet of sensitized material, flexible protective sheets upon each side thereof, the protective sheets being of larger dimensions than said sensitized sheet and extending beyond the edges thereof, the extending marginal portions having therebetween a waterproof, slow-drying adhesive whereby the margins of the protective sheets are continuously joined around and outside of the periphery of the sensitized sheet, but are adapted to be readily stripped apart and constitute'the only means for holding the package closed and light tight. l

3. In a dentalX-ray package, a fiat sheet 'of sensitized material, a protective sheet upon one side thereof, a cover sheet upon the other side thereof, the .protective and cover sheets' being of opaque, substantially inextensible flexible material and of larger dimensions than said sensitized sheet and extending beyond the edges thereof in all directions, the extending margins of the cover sheet being coated with a slow-drying, Waterproof, flexible adhesive whereby the marginal portions of the protective and cover sheets are joined in a continuous lighttigl1t and Water-tight oint around and outside of the edge of the sensitized sheet, and are ,capable of being readily stripped apart.

4. In a dental X-ray package, a sheet of sensitized material, protective sheets upon each side of said sheet, the marginal portions of the protective sheets havmg therebetween a slow-drying, flexible adhesive whereby the margins of the protective sheets are continuously joined to form a light-tight joint around the periphery of the package and uncoated tabs extending from each of said protective sheets, Whereliy they may be manipulated to be readily stripped apart.

5. In a dental X-ray package, a. sheet of sensitized material and a thin, flexible protective covering upon each side thereof, one of the protective covers having a coating in which is incorporated the salt of a heavy metal.

6. In a dental X-ray package, a sheet of sensitized material and a thin, flexible protective covering upon each side thereof, one of the protective covers having a coating in which is incorporated the salt of a lheavy metal, the protective covers having adhesive contact with each other at their edges to form a light-tight joint,

7. In a dental .fX-raypackage, a sheet of sensitized material, and a protective covering upon each side thereof, one of the protective covers being flexible and having a coating of adhesive in which is incorporated the salt of a heavy metal, a part of said adhesive coating serving to unite the protective covers to form a light-tight joint.

8. In a dental X-ray package, a sheet of sensitized material and a flexible protective covering upon each side thereof, one of the protective covers having over the entire area thereof a coating of slow-drying, Waterproof, flexible adhesive in which is incorporated the salt of a heavy metal, the protective lcovers having adhesive contact with each other at their marginal portions to form a light and Water-tight joint around the edge of the package.

9. In a dental X-ray package, a sheet of sensitized film, a protective sheet upon one side thereof, a cover sheet on the opposite side thereof, the protective and cover sheets being flexible and of larger dimensions than .and cover sheets being said sensitized sheet and extending beyond the edges thereof, the cover sheet having over its entire .area acoating of a Waterproof, slow-drying adhesive, in which is incorporated the salt of a heavy metal, the projecting marginal portions of the protective joined by said adhesive eontinuously around and outside of the periphery of the film.

lO. Tn a dental X-ray package, a sheet of photographic film, protective sheets upon each side of said sheet, the edge portions of said protective sheets being joined to form a light-tight joint, each of said protective sheets having extending tabs whereby they may be stripped apart, one of said sheets being Waterproof and being attached` to the film by a waterprootl adhesive, whereby the film will adhere thereto during photographic manipulations. Y

ll. In a dental X-ra'y package, a sheet of sensitized material, protective sheets upon each side thereof, theedge portions of said protective sheets being joined by a slowdryingg'fiexible adhesive to form a lighttight joint, each of said protective sheets having an uncoated extending tab whereby the may be readil stripped apart, one of sai sheetsy being o material that is not injuriously affected by water and being attached to the film by a waterproof adhesive, whereby the said sheetrma be lused as a means for manipulating the lm during photographie operations.

12. In a dental X-ray package, a sheet of sensitized film, roteetive cover sheets upon the opposite sides thereof joined 'at their edges by a slow-drying adhesive whereby they may be readily stripped apart, one of said sheets being impervious to the effects ot moisture and the sheet of film being attached thereto` by an adhesive which is u naffected yby the ordinary photographie baths, whereby the film will continue to adhere to the said protective sheet when the package is opened in the manner mentioned, and wherebyithe said cover sheet may be used in the manipulation of the film in the photographic baths. i

Signed at Rochester, NewYork, this 9th day ot' July, 1920. 1 l

, MILLARD B. HODGSON. 

